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Share-based compensation - Plans (Details) - shares
1 Months Ended 9 Months Ended
Aug. 31, 2021
Sep. 30, 2022
Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period   10 years  
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted 13,500    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   4 years  
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   1 year  
2018 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant     388,748
2020 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Threshold Percentage Of Total Number Of Common Stock Outstanding   4.00%  
Shares available for future issuance   1,336,088  
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant   352,446  
Authorized stock options   125,000  
Employee Stock Purchase Plan, Threshold Period For Which Common Stock Is Automatically Added To Arrive At Authorized Shares   10 years  
Percentage of outstanding capital stock   1.00%  
Number of common shares added in authorized   1,000,000  
Awards granted   0